Codeforces Round #452 (Div. 2) A
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#include<iostream>#include<algorithm>#include<iomanip>#include<cstdio>#include<cstdlib>#include<cstring>#include<string>#include<cmath>#include<set>#include<queue>#include<stack>#include<map>#define PI acos(-1.0)#define in freopen("in.txt", "r", stdin)#define out freopen("out.txt", "w", stdout)#define kuaidian ios::sync_with_stdio(0);using namespace std;typedef long long ll;typedef unsigned long long ull;const int maxn = 2e5 + 7, maxd = 1e8;const ll mod = 1e9 + 7;const int INF = 0x7f7f7f7f;int n;int main() { scanf("%d", &n); int a = 0, b = 0; for(int i = 0; i < n; ++i) { int x; scanf("%d", &x); if(x == 1) a++; else b++; } int ans = 0; if(a >= b) { ans = b; a -= b; ans += (a / 3); } else { ans = a; } printf("%d", ans); return 0;}
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